Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurement - Additional Information (Detail)

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Fair Value Measurement - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended 12 Months Ended
May 31, 2013
May 31, 2013
May 31, 2012
Aug. 31, 2012
Aug. 31, 2012
Mastervolt International Holding B.V.
May 31, 2013
Senior Notes
5.625% Senior Notes
Aug. 31, 2012
Senior Notes
5.625% Senior Notes
Apr. 16, 2012
Senior Notes
5.625% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Long-term Debt $ 392,500,000 $ 392,500,000   $ 397,500,000   $ 300,000,000 $ 300,000,000  
Goodwill 647,150,000 647,150,000   866,412,000 40,000,000      
Tradename         13,600,000      
Impairment charge 170,300,000 170,052,000 0   62,500,000      
Outstanding debt, amount           300,000,000    
Debt instrument, interest rate           5.625%   5.625%
Fair value of long-term debt           $ 309,800,000